<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>

</body>
<script>
    // function factorial(num) {
    //     let result = 1;
    //     while (num) {
    //         result = result * num;
    //         num--;
    //     }
    //     return result;
    // }

    function factorial(num) {
        if (num <= 1) {
            return 1;
        } else {
            return num * factorial(num - 1);
        }
    }

    console.log(factorial(10))
</script>

</html>